US5844033AExpiredUtilityPatentIndex 55

Polycarbonate resin composition

Assignee: MUNEKATA TOHOKU KKPriority: Jul 10, 1996Filed: Jul 7, 1997Granted: Dec 1, 1998

Est. expiryJul 10, 2016(expired)· nominal 20-yr term from priority

Inventors:NIKKESHI SUSUMU MASUKO TORU TOMINAGA AKIKO

C08K 9/12

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Claims

Abstract

A polycarbonate resin composition comprising substantially: 94.0-99.5% by weight of a polycarbonate resin, and 0.5-6.0% by weight of zeolite having tannic acid adsorbed thereon. In this polycarbonate resin composition, the molecular weight reduction of polycarbonate resin is suppressed.

Claims

exact text as granted — not AI-modified

We claim: 
     
       1. A polycarbonate resin composition containing essentially of: 94.0-99.5% by weight of a polycarbonate resin, and   0.5-6.0% by weight of zeolite having tannic acid adsorbed thereon.   
     
     
       2. A polycarbonate resin composition according to claim 1, wherein the adsorption of tannic acid on zeolite is conducted by treating 100 parts by weight of zeolite with an aqueous solution containing 2-18 parts by weight of tannic acid. 
     
     
       3. A polycarbonate resin composition according to claim 1, wherein zeolite is synthetic or natural zeolite.

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